Keel void/water - impact on waterline?

[drm901]

I noticed the stern of my boat is about 2" lower than earlier in the season.  it could because of the 10' of heavy anchor chain in the farthest stern area of the stern lazerette, the lack of water in the tank, or the evil keel void full of water.  did anyone notice a shift in their water line?  the bow is about the same amount higher, so I'm leaning (maybe just praying) that the chain and water tank are the reasons.

[Bill]

. . .it could because of the 10' of heavy anchor chain in the farthest stern area of the stern lazerette, the lack of water in the tank, . . .

I would mostly vote for the 2 above . . .